Mr. Pryns Hopkins' book is outstanding in a number of respects. In the first place he has a simple and ingratiating style of exposition, and, within the somewhat limited range he has purposely set himself, gives an unusually readable and persuasive account of a number of established psycho-analytical findings. Secondly, he is not only a convinced and enthusiastic follower of Freud, but a convinced and enthusiastic social reformer. And he makes no bones about it in this book, which is an attempt to combine an analysis of individual and social maladaptations with a justification of the principles of ethical hedonism. The latter he regards as the most suitable yardstick with which to measure, and, presumably,